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Chemistry Mystery

Across
a particle with a positive charge in an atom
a particle with no charge in an atom
a chart that organizes elements
the number of proton plus the number of neutrons in an atom
smallest particle, everything is made of atoms
a substance that has a certain shape and volume
substance that cannot be broken into smaller pieces
a group on the periodic table
Down
a horizontal row of elements on the periodic table
a vertical line of elements on the periodic table
the number of protons inside an atom
the center of an atom
has neither a certain volume or shape
a particle with a negative charge in an atom
has a certain volume, but forms to the shape of its container